RAC4IT
Needs a job
Bergie
Posts: 3009
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posted April 30, 2002 11:46 AM
Huge difference in dyno numbers?
Just wondering if anyone else has ever seen such a dramatic difference in dyno results:
Same bike- no changes- two different dynos- 16rwhp difference? Fast Lane is local to me so I have a complete dyno history of my mods online: http://www.dontbescaredracing.com/dyno/
Any thoughts?
  
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jessz1
Expert Class
Half the wheels, twice the fun
Posts: 373
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posted April 30, 2002 12:16 PM
Lee's Dyno is overrated. Ask around and you will see.
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I'm never satisfied.
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madmike
Moderator
FEAR THE BLACK FLAG!!!!!!!!
Posts: 6579
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posted April 30, 2002 12:20 PM
havent been to the dyno yet! but I am going to be going very soon!! I will let you know how it shapes up!
Mad Mike...
maybe lees was not corrected ????? dont know what did he say about it.
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200-MPH CLUB MEMBER!
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ZRXDean
Needs a job
Posts: 2225
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posted April 30, 2002 12:29 PM
That looks normal to me, I have heard dynos vary around 10%. Makes sense to stick with the same particular dyno for before/after tuning. I guess it wouldn;t matter as much for mapping, as long as the numbers get higher... 
I am about to go to a new dyno (Kevin's new shop in Jax) after going to Jeff's at HP Cycle in Lake City for a year. No problems with Jeff, he is excellent, I just want to try the load-control, nifty setup at Kevin's.
I got the ZRX up and running, I'm eager to see what the OS valves did for me. 240-250psi compression, yeehaw 
Dean
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krexken
Zone Head
Posts: 732
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posted April 30, 2002 02:03 PM
I've seen about the same difference on different dynos. I advertise the higher one, of course. Dragstrip mph is all that matters to me though.
Can't wait to hear how your bike performs, Dean. Still waiting on my block. May have to send to crank off to get lengthened since it's just sitting there.
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ZRXDean
Needs a job
Posts: 2225
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posted April 30, 2002 02:35 PM
Ken - I just got off the phone with Mike - he wants you to call and talk about your block. 954-484-6969 He's there now, 6:30pm Tues.
I'll post the charts when I get some new numbers. Test-n-tune tomorrow nite..
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zx12richard
Pro
The Green Monster..
Posts: 1133
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posted April 30, 2002 03:39 PM
 Edited By: zx12richard on 30 Apr 2002 16:40
I have also seen same difference on dynos.... Dynoed at one place then drove straight to other and dynoed more..... Happy dynos and Sad dynos....... I prefer the Happy ones....
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addisonzx12
Expert Class
Posts: 213
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posted April 30, 2002 05:38 PM
You have to make sure you get the SAE correction factor used. I believe those are input manually. That's one source of the difference. But I CONSTANTLY hear on ALL the boards that Lee's is a VERY HAPPY dyno. Most of the big bore/stroked 12's are getting between 190 & 200hp on pump gas, anything more than 205hp SAE I would be very suspicious of on pump gas, now nutec fuel would be different.
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted April 30, 2002 07:20 PM
quote:
maybe lees was not corrected ????? dont know what did he say about it.
Lee hasn't given me an answer, yet. Both charts say "SAE" which means corrected, otherwise it would indicate "Actual" on the chart. Who knows. I'm not pointing any fingers- just presenting the facts as I see them.
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ra12r
Zone Head
Posts: 919
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posted April 30, 2002 07:54 PM
you also are using Lee Cams too right? How do you feel about the hp curve at the high end? Looks like your making your peak power between 7-8rpm.
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MadMike
Moderator
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posted April 30, 2002 08:14 PM
ra, that is the torque curve that your looking at, the HP is the one that peaks on the right side of the chart.
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ra12r
Zone Head
Posts: 919
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posted May 01, 2002 06:26 AM
Mike thanks, you are right,,,,,,,,hahahaha I like the hp curve, but looks like that torque curve is saying that the bike MIGHT be a challenge to launch?!
What was done to the cams?!
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All must bow to the "Ra Supremecy"...
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jessz1
Expert Class
Half the wheels, twice the fun
Posts: 373
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posted May 01, 2002 07:18 AM
Yeah, the tourque curve is weird on the second one more than the first. Mine is damn near flat. I wonder why it would have such a big peak?
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I'm never satisfied.
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted May 01, 2002 09:18 AM
Stock cams
quote:
you also are using Lee Cams too right? How do you feel about the hp curve at the high end? Looks like your making your peak power between 7-8rpm.
No- stock cams. Stock intake on the exhaust. He offers a larger set but I couldn't afford to do them right now. Maybe next time around. The bike is a 1361; stock head and valves with mild cleanup; K&N filters; muzzys fuelpump; stock intake cam on both sides; stock timing; NO PC3R; pump gas; muzzys exhaust.
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted May 01, 2002 09:21 AM
quote:
Yeah, the tourque curve is weird on the second one more than the first. Mine is damn near flat. I wonder why it would have such a big peak?
Not sure? It's running with the stock computer only, no PC3R on the bike yet, so I think it needs some tuning. My PC3R took a shit so I have to send it back for a replacement. Will keep you posted.
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted May 01, 2002 01:00 PM
Now you see why dyno numbers drive us nuts.
"But you SAID I'D GET XXX hp!!! I only got YYY! I want my money back!!"
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted May 01, 2002 02:10 PM
quote:
Now you see why dyno numbers drive us nuts.
"But you SAID I'D GET XXX hp!!! I only got YYY! I want my money back!!"
Hell yeah Doug I completely understand! To be honest I'm very happy with the bike; it rides better than ever before especially on the street with the extra torque and 25 ponies your 1361 offers. This is how Kawasaki SHOULD have made the bike to begin with. Whoever said the 1361 wasn't streetable probably never rode one!
We just ordered a 1270cc Muzzys kit from SpencerCycle for my buddies bike, which we will do a full comparison against the 1361 on www.dontbescaredracing.com this summer.
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oldkawboy
Needs a job
Posts: 2125
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posted May 01, 2002 06:59 PM
What seems odd to me is where the hp & tq cross each other, 1000rpms difference between the dynos???
Bottom line..........I'd be tickled even with the low reading! Good numbers, keep us posted on how it runs.
Dan
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted May 10, 2002 10:47 AM
Old KAwboy,
This is a common problem with Dyno jet charts. You'll notice that the torque and hp chcurves are on differnt scales. As I'm SURE you know, torque and hp curves ALWAYS cross at 5252 rpm. Plot them on the same xy scale and you'll see. (this is not a function of the engine's characteristics but of the Hp=torqxRPM /5252 equation).
I'll soon be posting a tech article on the Muzzy site that explains this.
Doug
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
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oldkawboy
Needs a job
Posts: 2125
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posted May 11, 2002 11:21 AM
Doug,
Thanks for the input, I'll be reading the article as soon as you get it placed. Didn't see you at the Spring Nats in Virginia, but we did see the rain, AGAIN!
Dan
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BA
Pro
Posts: 1592
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posted May 12, 2002 11:42 AM
Well, if Lee's is the guy that rolls up to Mid-Ohio every year, then I can attest that it's pretty happy.
Mine and a friends had 182hp on his dyno, stock 12R engine, with just a pipe added. (HMF and Micron)
On my 'regular' dyno, my bike had 172 the last time I checked. Both are certainly the "corrected" numbers, not raw numbers.
Pretty common stuff for sure....
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